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BTH ULTRA Electric Boilers Installation & Operation manual (Revision: June 2015) 7
Section 3: INSTALLATION
The manufacturer’s warranty does not cover any damage or defect caused by installation, or
attachment, or use of any special attachment other than those authorized by the manufacturer
into, onto, or in conjunction with the water heater. The use of such unauthorized devices may
shorten the life of the boiler and may endanger life and property. The manufacturer disclaims any
responsibility for such loss or injury resulting from the use of such unauthorized devices
3.1 SAFETY MEASURES
All installation will include the supplied pressure
relief valve which limits the maximum operating
pressure to 30 psi (207 kPa).
This electric boiler is designed to be installed on
a circuit operated between 50°F to 190°F (10°C
to 90°C) and at a maximum operating pressure
of 30 psi (207 kPa).
The unit in designed solely to be used on a
close loop hydronic heating system. The heat
transfer solution must be a solution of water or if
a freeze protection is required, a mix solution
Water/propylene glycol specially made for
hydronic heating systems and having a
maximum concentration of 50% (do not use
plumbing or automobile glycol).
The boiler is equipped with an automatic high
limit temperature control set at 210°F 99°C) and
some models have a second limit device
manually re-settable set at 227F (108C). If the
heating distribution system on which the boiler is
installed requires a high limit controller having a
lower setting, this controller will be added to the
system and connected in series with the factory
installed limit control.
3.2 LOCATION
The electric boiler should be installed in a clean,
dry location. Long hot water lines should be
insulated to conserve water and energy. The
electric boiler and water lines should be
protected from exposure to freezing
temperature.
The boiler can be mounted vertically or
horizontally directly on a solid surface with 4
adequate screws inserted in the provided boiler
openings. Make sure it is properly leveled
The electric boiler must be located or protected
so as not to be subject to physical damage, for
example, by moving vehicles, area flooding, etc.
All models can be installed directly on a
combustible wall and into an alcove. The
location must have sufficient ventilation to
maintain an ambient temperature not exceeding
90°F (32°C).
The electric boiler should not be located in
an area where leakage of the tank or water
connections will result in damage to the
adjacent area or to lower floors of the
structure. When such areas cannot be
avoided, a suitable drain pan or non-
flammable catch pan, adequately drained
must be installed under the boiler.
The pan must be connected to a drain.
NOTE: Auxiliary catch pan MUST conform to
local codes.
3.3 CLEARANCES
For adequate inspection and servicing the
following minimum clearance is necessary:
Table 4: Boiler Clearances
Sides
3 inches
Electric elements side
14 inches
Front side of the boiler
3 inches*
Back
0 inches
*If the boiler is installed in a closed
compartment, allow an access service opening
and adequate ventilation to maintain an ambient
temperature lower than 90°F/32°C.
CAUTION
!
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